class PDF::Reader::Filter::Flate

def filter(data)
  deflated = nil
  begin
    deflated = Zlib::Inflate.new.inflate(data)
  rescue Zlib::DataError => e
    # by default, Ruby's Zlib assumes the data it's inflating
    # is RFC1951 deflated data, wrapped in a RFC1951 zlib container.
    # If that fails, then use an undocumented 'feature' to attempt to inflate
    # the data as a raw RFC1951 stream.
    #
    # See
    # - http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/243545
    # - http://www.gzip.org/zlib/zlib_faq.html#faq38
    deflated = Zlib::Inflate.new(-Zlib::MAX_WBITS).inflate(data)
  end
  Depredict.new(@options).filter(deflated)
rescue Exception => e
  # Oops, there was a problem inflating the stream
  raise MalformedPDFError,
    "Error occured while inflating a compressed stream (#{e.class.to_s}: #{e.to_s})"
end

def initialize(options = {})
  @options = options
end